I'm starting the 8th week of the flower, should I start flushing? or leave it for at least 2 weeks? hawai wai sativa strain

As m0use said, it's personal preference whether to flush or not ... I tend to do the "only water" for the last couple of feedings, but don't flush specifically. However, the main thing I wanted to say, is that by the looks of those buds, I'd say they probably have 2-3 weeks left. The hairs (pistils) are still mostly white - and firm (meaning, they stick out pretty straight). In most cases ... you wait until the trichomes are mostly red - but not JUST red ... red and curled in (shriveled up, more or less). I see so many people on here harvesting way too early. You will get so much more weight, if you wait (no pun intended) :)